nothing to write home about
Ordinary or unremarkable, as in The restaurant was all right but nothing to write home about. This idiom originated in the late 1800s, possibly among troops stationed far from home, and became widespread during World War I.
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.